all: skip tests that fail on android/arm64

Many of the tests skipped platforms that build PIE binaries by
default, but (still) lack a central function to report which platforms
those are.

Some of the tests assumed (but did not check for) internal linking
support, or invoked `go tool link` directly without properly
configuring the external linker.

A few of the tests seem to be triggering latent bugs in the linker.

For #58806.
For #58807.
For #58794.

Change-Id: Ie4d06b1597f404590ad2abf978d4c363647407ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/472455
Reviewed-by: Cherry Mui <[email protected]>
Auto-Submit: Bryan Mills <[email protected]>
Run-TryBot: Bryan Mills <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: Bryan C. Mills

src/cmd/link/elf_test.go

@@ -340,7 +340,7 @@ func TestPIESize(t *testing.T) {
 					t.Logf("%s", out)
 				}
 				if err != nil {
-					t.Error(err)
+					t.Log(err)
 				}
 				return err
 			}
@@ -358,6 +358,9 @@ func TestPIESize(t *testing.T) {
 			}()
 			wg.Wait()
 			if errexe != nil || errpie != nil {
+				if runtime.GOOS == "android" && runtime.GOARCH == "arm64" {
+					testenv.SkipFlaky(t, 58806)
+				}
 				t.Fatal("link failed")
 			}
 

src/cmd/link/internal/ld/dwarf_test.go

@@ -227,7 +227,10 @@ func main() {
 		}
 		switch entry.Tag {
 		case dwarf.TagStructType:
-			name := entry.Val(dwarf.AttrName).(string)
+			name, ok := entry.Val(dwarf.AttrName).(string)
+			if !ok {
+				continue
+			}
 			wantMembers := want[name]
 			if wantMembers == nil {
 				continue
@@ -888,8 +891,10 @@ func TestRuntimeTypeAttrInternal(t *testing.T) {
 		t.Skip("skipping on plan9; no DWARF symbol table in executables")
 	}
 
-	if runtime.GOOS == "windows" {
-		t.Skip("skipping on windows; test is incompatible with relocatable binaries")
+	// TODO(#58807): factor this condition out into a function in
+	// internal/platform so that it won't get out of sync with cmd/link.
+	if runtime.GOOS == "android" || runtime.GOOS == "windows" {
+		t.Skipf("skipping on %s; test is incompatible with relocatable binaries", runtime.GOOS)
 	}
 
 	testRuntimeTypeAttr(t, "-ldflags=-linkmode=internal")
@@ -980,8 +985,10 @@ func main() {
 		t.Fatalf("*main.X DIE had no runtime type attr. DIE: %v", dies[0])
 	}
 
-	if runtime.GOOS == "darwin" && runtime.GOARCH == "arm64" {
-		return // everything is PIE on ARM64, addresses are relocated
+	// TODO(#58807): factor this condition out into a function in
+	// internal/platform so that it won't get out of sync with cmd/link.
+	if (runtime.GOOS == "darwin" && runtime.GOARCH == "arm64") || runtime.GOOS == "android" {
+		return // everything is PIE, addresses are relocated
 	}
 	if rtAttr.(uint64)+types.Addr != addr {
 		t.Errorf("DWARF type offset was %#x+%#x, but test program said %#x", rtAttr.(uint64), types.Addr, addr)
@@ -1548,6 +1555,7 @@ func TestIssue39757(t *testing.T) {
 
 func TestIssue42484(t *testing.T) {
 	testenv.MustHaveGoBuild(t)
+	testenv.MustInternalLink(t, false) // Avoid spurious failures from external linkers.
 
 	if runtime.GOOS == "plan9" {
 		t.Skip("skipping on plan9; no DWARF symbol table in executables")

src/cmd/link/internal/ld/ld_test.go

@@ -65,6 +65,9 @@ func TestUndefinedRelocErrors(t *testing.T) {
 		case n > 0:
 			t.Errorf("unmatched error: %s (x%d)", want, n)
 		case n < 0:
+			if runtime.GOOS == "android" && runtime.GOARCH == "arm64" {
+				testenv.SkipFlaky(t, 58807)
+			}
 			t.Errorf("extra errors: %s (x%d)", want, -n)
 		}
 	}

src/cmd/link/link_test.go

@@ -41,6 +41,7 @@ func TestIssue21703(t *testing.T) {
 	t.Parallel()
 
 	testenv.MustHaveGoBuild(t)
+	testenv.MustInternalLink(t, false)
 
 	const source = `
 package main
@@ -70,6 +71,9 @@ func main() {}
 	cmd.Dir = tmpdir
 	out, err = cmd.CombinedOutput()
 	if err != nil {
+		if runtime.GOOS == "android" && runtime.GOARCH == "arm64" {
+			testenv.SkipFlaky(t, 58806)
+		}
 		t.Fatalf("failed to link main.o: %v, output: %s\n", err, out)
 	}
 }
@@ -82,6 +86,7 @@ func TestIssue28429(t *testing.T) {
 	t.Parallel()
 
 	testenv.MustHaveGoBuild(t)
+	testenv.MustInternalLink(t, false)
 
 	tmpdir := t.TempDir()
 
@@ -97,6 +102,9 @@ func TestIssue28429(t *testing.T) {
 		cmd.Dir = tmpdir
 		out, err := cmd.CombinedOutput()
 		if err != nil {
+			if len(args) >= 2 && args[1] == "link" && runtime.GOOS == "android" && runtime.GOARCH == "arm64" {
+				testenv.SkipFlaky(t, 58806)
+			}
 			t.Fatalf("'go %s' failed: %v, output: %s",
 				strings.Join(args, " "), err, out)
 		}
@@ -763,6 +771,7 @@ func TestIndexMismatch(t *testing.T) {
 	// This shouldn't happen with "go build". We invoke the compiler and the linker
 	// manually, and try to "trick" the linker with an inconsistent object file.
 	testenv.MustHaveGoBuild(t)
+	testenv.MustInternalLink(t, false)
 
 	t.Parallel()
 
@@ -797,6 +806,9 @@ func TestIndexMismatch(t *testing.T) {
 	t.Log(cmd)
 	out, err = cmd.CombinedOutput()
 	if err != nil {
+		if runtime.GOOS == "android" && runtime.GOARCH == "arm64" {
+			testenv.SkipFlaky(t, 58806)
+		}
 		t.Errorf("linking failed: %v\n%s", err, out)
 	}
 

src/cmd/nm/nm_test.go

@@ -165,6 +165,14 @@ func testGoExec(t *testing.T, iscgo, isexternallinker bool) {
 				return true
 			}
 		}
+		// Code is always relocated if the default buildmode is PIE.
+		//
+		// TODO(#58807): factor this condition out into a function in
+		// internal/platform so that it won't get out of sync with cmd/go and
+		// cmd/link.
+		if runtime.GOOS == "android" {
+			return true
+		}
 		if runtime.GOOS == "windows" {
 			return true
 		}
@@ -198,7 +206,12 @@ func testGoExec(t *testing.T, iscgo, isexternallinker bool) {
 				stype = "D"
 			}
 			if want, have := stype, strings.ToUpper(f[1]); have != want {
-				t.Errorf("want %s type for %s symbol, but have %s", want, name, have)
+				if runtime.GOOS == "android" && name == "runtime.epclntab" && have == "D" {
+					// TODO(#58807): Figure out why this fails and fix up the test.
+					t.Logf("(ignoring on %s) want %s type for %s symbol, but have %s", runtime.GOOS, want, name, have)
+				} else {
+					t.Errorf("want %s type for %s symbol, but have %s", want, name, have)
+				}
 			}
 			delete(runtimeSyms, name)
 		}

src/cmd/pack/pack_test.go

@@ -13,6 +13,7 @@ import (
 	"io/fs"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"sync"
 	"testing"
@@ -191,6 +192,7 @@ func TestExtract(t *testing.T) {
 // Test that pack-created archives can be understood by the tools.
 func TestHello(t *testing.T) {
 	testenv.MustHaveGoBuild(t)
+	testenv.MustInternalLink(t, false)
 
 	dir := t.TempDir()
 	hello := filepath.Join(dir, "hello.go")
@@ -413,6 +415,9 @@ func doRun(t *testing.T, dir string, args ...string) string {
 	cmd.Dir = dir
 	out, err := cmd.CombinedOutput()
 	if err != nil {
+		if t.Name() == "TestHello" && runtime.GOOS == "android" && runtime.GOARCH == "arm64" {
+			testenv.SkipFlaky(t, 58806)
+		}
 		t.Fatalf("%v: %v\n%s", args, err, string(out))
 	}
 	return string(out)

src/cmd/pprof/pprof_test.go

@@ -75,7 +75,11 @@ func mustHaveDisasm(t *testing.T) {
 	}
 
 	// Skip PIE platforms, pprof can't disassemble PIE.
-	if runtime.GOOS == "darwin" && runtime.GOARCH == "arm64" {
+	//
+	// TODO(#58807): factor this condition out into a function in
+	// internal/platform so that it won't get out of sync with cmd/go and
+	// cmd/link.
+	if (runtime.GOOS == "darwin" && runtime.GOARCH == "arm64") || runtime.GOOS == "android" {
 		t.Skipf("skipping on %s/%s, issue 46639", runtime.GOOS, runtime.GOARCH)
 	}
 }

src/runtime/crash_cgo_test.go

@@ -520,6 +520,9 @@ func TestCgoTracebackSigpanic(t *testing.T) {
 	t.Log(got)
 	want := "runtime.sigpanic"
 	if !strings.Contains(got, want) {
+		if runtime.GOOS == "android" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64") {
+			testenv.SkipFlaky(t, 58794)
+		}
 		t.Errorf("did not see %q in output", want)
 	}
 	// No runtime errors like "runtime: unexpected return pc".